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A COVALENT MICRO NANOCOMPOSITE RESISTANT TO HIGH-TEMPERATURE OXIDATION

机译:价高的微纳米复合材料,耐高温氧化

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摘要

ADVANCED ceramic materials that can withstand high temperatures (over 1,500 degrees C) without degradation or oxidation are needed for applications such as structural parts for motor engines, gas turbines, catalytic heat exchangers and combustion systems(1,2). Hard, oxidation-resistant ceramic composites and coatings are also in demand for use on aircraft and spacecraft, Silicon nitride (Si3N4) and silicon nitride/carbide (Si3S4/SiC) composites are good candidates for such high-temperature applications(2,3). Commercial Si3N4 parts can be used in oxidizing environments up to 1,200-,1,300 degrees C (ref. 4), but are oxidized at still higher temperatures. Here ne describe the synthesis of a covalent ceramic composite which is resistant to oxidation at temperatures up to 1,600 degrees C. The composite is formed from an amorphous silicon carbonitride which crystallizes at high temperature into a composite of alpha-Si3N4 microcrystals and alpha-SiC nanocrystals. The oxidation resistance stems from the formation of a passivating surface layer of SiO2 a few micrometres thick. [References: 9]
机译:诸如汽车发动机,燃气轮机,催化换热器和燃烧系统的结构零件等应用需要能够承受高温(超过1,500摄氏度)而不降解或氧化的高级陶瓷材料(1,2)。硬质,抗氧化陶瓷复合材料和涂料也需要在飞机和航天器上使用,氮化硅(Si3N4)和氮化硅/碳化硅(Si3S4 / SiC)复合材料是此类高温应用的良好选择(2,3) 。商业Si3N4零件可在最高1200至1,300摄氏度(参考4)的氧化环境中使用,但在更高的温度下仍会被氧化。本文中描述了一种共价陶瓷复合材料的合成,该复合材料在高达1600摄氏度的温度下具有抗氧化性。该复合材料由无定形碳氮化硅形成,该碳氮化硅在高温下结晶成α-Si3N4微晶和α-SiC纳米晶的复合物。 。抗氧化性源自形成几微米厚的SiO2钝化表面层。 [参考:9]

著录项

  • 来源
    《Nature》 |1995年第6522期|p. 526-528|共3页
  • 作者单位

    TH DARMSTADT FACHBEREICH MAT WISSENSCH FACHGEBIET DISPERSE FESTSTOFFE HILPERTSTR 31 GDP D-64295 DARMSTADT GERMANY;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

    Ceramics;

    机译:陶瓷;

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